From be4cbb16681ba9274b3017d9ccf3bcb2a2dbc30c Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Thu, 18 Jan 2001 01:12:39 +0000
Subject: Use rich comparisons to fulfill an old wish: complex numbers now
 raise exceptions when compared using <, <=, > or >=.

NOTE: This is a tentative change: this means that cmp() involving
complex numbers will raise an exception when the numbers differ, and
that in turn means that e.g. dictionaries and certain other compounds
(e.g. UserLists) containing complex numbers can't be compared either.
So we'll have to decide whether this is acceptable.  The alpha test
cycle is a good time to keep an eye on this!
---
 Objects/complexobject.c | 133 ++++++++++++++++++++++++++++++------------------
 1 file changed, 84 insertions(+), 49 deletions(-)

diff --git a/Objects/complexobject.c b/Objects/complexobject.c
index dc1d837..a0dd9d5 100644
--- a/Objects/complexobject.c
+++ b/Objects/complexobject.c
@@ -210,22 +210,6 @@ complex_repr(PyComplexObject *v)
 	return PyString_FromString(buf);
 }
 
-static int
-complex_compare(PyComplexObject *v, PyComplexObject *w)
-{
-	/* Note: "greater" and "smaller" have no meaning for complex numbers,
-	   but Python requires that they be defined nevertheless. */
-	Py_complex i, j;
-	i = v->cval;
-	j = w->cval;
-	if (i.real == j.real && i.imag == j.imag)
-		return 0;
-	else if (i.real != j.real)
-		return (i.real < j.real) ? -1 : 1;
-	else
-		return (i.imag < j.imag) ? -1 : 1;
-}
-
 static long
 complex_hash(PyComplexObject *v)
 {
@@ -421,6 +405,47 @@ complex_coerce(PyObject **pv, PyObject **pw)
 }
 
 static PyObject *
+complex_richcompare(PyObject *v, PyObject *w, int op)
+{
+	int c;
+	Py_complex i, j;
+	PyObject *res;
+
+	if (op != Py_EQ && op != Py_NE) {
+		PyErr_SetString(PyExc_TypeError,
+			"cannot compare complex numbers using <, <=, >, >=");
+		return NULL;
+	}
+
+	c = PyNumber_CoerceEx(&v, &w);
+	if (c < 0)
+		return NULL;
+	if (c > 0) {
+		Py_INCREF(Py_NotImplemented);
+		return Py_NotImplemented;
+	}
+	if (!PyComplex_Check(v) || !PyComplex_Check(w)) {
+		Py_DECREF(v);
+		Py_DECREF(w);
+		Py_INCREF(Py_NotImplemented);
+		return Py_NotImplemented;
+	}
+
+	i = ((PyComplexObject *)v)->cval;
+	j = ((PyComplexObject *)w)->cval;
+	Py_DECREF(v);
+	Py_DECREF(w);
+
+	if ((i.real == j.real && i.imag == j.imag) == (op == Py_EQ))
+		res = Py_True;
+	else
+		res = Py_False;
+
+	Py_INCREF(res);
+	return res;
+}
+
+static PyObject *
 complex_int(PyObject *v)
 {
 	PyErr_SetString(PyExc_TypeError,
@@ -474,29 +499,29 @@ complex_getattr(PyComplexObject *self, char *name)
 }
 
 static PyNumberMethods complex_as_number = {
-	(binaryfunc)complex_add, /*nb_add*/
-	(binaryfunc)complex_sub, /*nb_subtract*/
-	(binaryfunc)complex_mul, /*nb_multiply*/
-	(binaryfunc)complex_div, /*nb_divide*/
-	(binaryfunc)complex_remainder,	/*nb_remainder*/
-	(binaryfunc)complex_divmod,	/*nb_divmod*/
-	(ternaryfunc)complex_pow, /*nb_power*/
-	(unaryfunc)complex_neg, /*nb_negative*/
-	(unaryfunc)complex_pos, /*nb_positive*/
-	(unaryfunc)complex_abs, /*nb_absolute*/
-	(inquiry)complex_nonzero, /*nb_nonzero*/
-	0,		/*nb_invert*/
-	0,		/*nb_lshift*/
-	0,		/*nb_rshift*/
-	0,		/*nb_and*/
-	0,		/*nb_xor*/
-	0,		/*nb_or*/
-	(coercion)complex_coerce, /*nb_coerce*/
-	(unaryfunc)complex_int, /*nb_int*/
-	(unaryfunc)complex_long, /*nb_long*/
-	(unaryfunc)complex_float, /*nb_float*/
-	0,		/*nb_oct*/
-	0,		/*nb_hex*/
+	(binaryfunc)complex_add, 		/* nb_add */
+	(binaryfunc)complex_sub, 		/* nb_subtract */
+	(binaryfunc)complex_mul, 		/* nb_multiply */
+	(binaryfunc)complex_div, 		/* nb_divide */
+	(binaryfunc)complex_remainder,		/* nb_remainder */
+	(binaryfunc)complex_divmod,		/* nb_divmod */
+	(ternaryfunc)complex_pow,		/* nb_power */
+	(unaryfunc)complex_neg,			/* nb_negative */
+	(unaryfunc)complex_pos,			/* nb_positive */
+	(unaryfunc)complex_abs,			/* nb_absolute */
+	(inquiry)complex_nonzero,		/* nb_nonzero */
+	0,					/* nb_invert */
+	0,					/* nb_lshift */
+	0,					/* nb_rshift */
+	0,					/* nb_and */
+	0,					/* nb_xor */
+	0,					/* nb_or */
+	(coercion)complex_coerce,		/* nb_coerce */
+	(unaryfunc)complex_int,			/* nb_int */
+	(unaryfunc)complex_long,		/* nb_long */
+	(unaryfunc)complex_float,		/* nb_float */
+	0,					/* nb_oct */
+	0,					/* nb_hex */
 };
 
 PyTypeObject PyComplex_Type = {
@@ -505,16 +530,26 @@ PyTypeObject PyComplex_Type = {
 	"complex",
 	sizeof(PyComplexObject),
 	0,
-	(destructor)complex_dealloc,	/*tp_dealloc*/
-	(printfunc)complex_print,	/*tp_print*/
-	(getattrfunc)complex_getattr,	/*tp_getattr*/
-	0,				/*tp_setattr*/
-	(cmpfunc)complex_compare,	/*tp_compare*/
-	(reprfunc)complex_repr,		/*tp_repr*/
-	&complex_as_number,    		/*tp_as_number*/
-	0,				/*tp_as_sequence*/
-	0,				/*tp_as_mapping*/
-	(hashfunc)complex_hash, 	/*tp_hash*/
+	(destructor)complex_dealloc,		/* tp_dealloc */
+	(printfunc)complex_print,		/* tp_print */
+	(getattrfunc)complex_getattr,		/* tp_getattr */
+	0,					/* tp_setattr */
+	0,					/* tp_compare */
+	(reprfunc)complex_repr,			/* tp_repr */
+	&complex_as_number,    			/* tp_as_number */
+	0,					/* tp_as_sequence */
+	0,					/* tp_as_mapping */
+	(hashfunc)complex_hash, 		/* tp_hash */
+	0,					/* tp_call */
+	0,					/* tp_str */
+	0,					/* tp_getattro */
+	0,					/* tp_setattro */
+	0,					/* tp_as_buffer */
+	Py_TPFLAGS_DEFAULT,			/* tp_flags */
+	0,					/* tp_doc */
+	0,					/* tp_traverse */
+	0,					/* tp_clear */
+	complex_richcompare,			/* tp_richcompare */
 };
 
 #endif
-- 
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